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Synthesis and Magnetic Properties of Hematite Particles in a “Nanomedusa” Morphology
Joint Authors
Lee, Jin-Bae
Jagličić, Zvonko
Kim, Hae Jin
Lužnik, Janez
Jelen, Andreja
Pajić, Damir
Wencka, Magdalena
Meden, Anton
Dolinšek, Janez
Source
Issue
Vol. 2014, Issue 2014 (31 Dec. 2014), pp.1-9, 9 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2014-11-20
Country of Publication
Egypt
No. of Pages
9
Main Subjects
Abstract EN
We present the synthesis, characterization, and magnetic properties of hematite particles in a peculiar “nanomedusa” morphology.
The particles were prepared from an iron-silica complex by a hydrothermal process in a solution consisting of ethyl acetate and ethanol.
The particles’ morphology, structure, and chemical composition were investigated by transmission electron microscopy, powder X-ray diffraction, and scanning electron microscope equipped with an energy-dispersive X-ray spectrometer.
The “hairy” particles consist of a spherical-like core of about 100 nm diameter and fibrous exterior composed of thin “legs” of 5 nm diameter grown along one preferential direction.
The particles’ cores are crystalline and undergo a magnetic phase transition to a weakly ferromagnetic state at a temperature of 930 K that matches reasonably the Néel temperature of bulk hematite.
However, unlike bulk hematite that undergoes Morin transition to an antiferromagnetic state around room temperature and small hematite nanoparticles that are superparamagnetic, the “nanomedusa” particles remain weakly ferromagnetic down to the lowest investigated temperature of 2 K.
Each particle thus represents a nanodimensional “hairy” ferromagnet in a very broad temperature interval, extending much above the room temperature.
Such high-temperature ferromagnetic nanoparticles are not frequently found among the nanomaterials.
American Psychological Association (APA)
Lee, Jin-Bae& Kim, Hae Jin& Lužnik, Janez& Jelen, Andreja& Pajić, Damir& Wencka, Magdalena…[et al.]. 2014. Synthesis and Magnetic Properties of Hematite Particles in a “Nanomedusa” Morphology. Journal of Nanomaterials،Vol. 2014, no. 2014, pp.1-9.
https://search.emarefa.net/detail/BIM-1042017
Modern Language Association (MLA)
Lee, Jin-Bae…[et al.]. Synthesis and Magnetic Properties of Hematite Particles in a “Nanomedusa” Morphology. Journal of Nanomaterials No. 2014 (2014), pp.1-9.
https://search.emarefa.net/detail/BIM-1042017
American Medical Association (AMA)
Lee, Jin-Bae& Kim, Hae Jin& Lužnik, Janez& Jelen, Andreja& Pajić, Damir& Wencka, Magdalena…[et al.]. Synthesis and Magnetic Properties of Hematite Particles in a “Nanomedusa” Morphology. Journal of Nanomaterials. 2014. Vol. 2014, no. 2014, pp.1-9.
https://search.emarefa.net/detail/BIM-1042017
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1042017